Brush-holder for dynamo-electric machines.



C! H. DILG.

BRUSH HOLDER FOR DYNAMO ELECTRIC MACHINES.

APPLICATION FILED OCT. 9, i917.

Patnted July 9, 1918.

INVENTOR. w w

ATTORNEYJ CHARLES H. J. DILG, OF NEW YORK, N. Y.

BRUSH-HOLDER F08 DYNAMO-ELEGTBIC MACHINES.

Specification of Letters Patent. Original application filed January 7, 1918, Serial No. 740,641. Divided and Patented July 9, 1918.

this application filed October 8,

1917. Serial No. 195,498.

To all whom it may concern Be it known that I, CHARLES H. J. Drno,

a citizen of the United States, residing at the city of New York, in the borough of Manhattan and State of New York, have invented certain new and useful Improvements in Brush-Holders for Dynamo-Electric Machines, of which the following is a full clear, and exact description.

My invention relates to brush holders for dynamo-electric machines, this application being a division of my application Serial Number 740,641, filed January 7, 1913. An object of my invention is to provide a construction of brush holder which will be simple and inexpensive, while effectively holding the brush at all times in good contact with the commutator. Another object is to afford ready access to the brush for thepurpose of obtaining or adjusting the resilient pressure of the brush against the commutator, or for other. purposes. Another ob ect is to provide a unitary structure which ma be easily and conveniently attached to or removed from the machine. Still other objects and advantages of my invention Wlll appear from the following description.

In accordance with my invention I provide a guide tube for the brush which is preferably stamped out of sheet metal so as to leave a longitudinal opening along one side, thereby readily aflordin access to the brush. One or more suppor ing arms are provided which are preferably integral with the tube portion and joining the same at one or both edges of the longitudinal opening. A resilient pressure device bears against the rear end of the brush, and the longitudinal opening in the tube is convenient for entering-the pressure device from without the tube, or for providing access to adjust the pressure. The resilient pres sure device may be conveniently mounted externally of the tube and have a portion extending within the opening and bearing against the brush and another portion extending in front of the longitudinal opening and preventing the brush from escaping from the opening. Preferably the pressure device is so mounted that it has a torque, and a desirable construction is to pivot the device on one of the supporting arms, a spring engaging the device and producing the torque. My invention also comprehends other features of construction as will hereinafter more fully appear.

I shall now describe the illustrated embodiments of my invention and shall there. after point out my invention in claims.

Figure l is a side elevation of a dynamo electric machine with brush holders embodying my invention;

Fig. 2 is a rear end elevation of the same: Figs. 3 and 4 are details in front and end elevation of the brush holder.

The illustrated embodiment of my invent1on is stamped out of a single piece of sheet material, such as sheet brass, to form a gu1de tube 1, open along its rear side to provide access to the brush 2, and to form two integral supporting arms 3- and 4 provided with elongated openings for attaching to insulated support-s on the rear head of themOtor casing, as shown in Figs. 1 and 2, the elongated openings permitting ad ustment of the holder to bring the brush into proper position with respect to the commutator 5. To hold the brushes in engagement with the commutator, resilient pressure means are provided arranged to bear against the outer or rear end of each brush, and comprising a pivotal arm 6, pivoted to the lower supporting arm 4 and bifurcated at its upper end. One portion or finger 7 extends upwardly in front of the open side of the guide tube 1 in position to hold the outer end of the brush 2 from escaping from the guide tube, and this finger 7 is turned outwardly at its upper endto provide a convenient handle for manipulating the pivoted pressure member. The other portion of the bifurcated end is bent inwardly and extends into the guide tube 1 in the rear of the brush 2 to provide an engaging finger 8 adapted to bear against the outer end of the brush. To cause the engaging finger 8 to exert yielding pressure against the brush to hold its inner end in engagement with the commutator, a coiled spring 9 is employed, which is attached at one end to a lug or anintegral car 10 on the supporting arm 4, and at its other end to an ear 11 on the pressure arm 6, and resiliently holds the finger 8 against the brush and forces the brush inwardly against the commutators. By these means contact ismaintained between the brush and the commutator, as the brush wears down, while the longitudinal opening along the exposed sideof the guide tube 1 provides ready access to the brush. The inner end of the brush is guided by two ears or-lugs 12 struck /itself to-provide a terminal clamping tongue 13. A screw 14 clamps the tongue upon the terminal while, the resiliency of the metal serves to release the terminal when the screw ing in front of the is relieved. I

Itwill be observed that the holder forms a unitary structure which is conveniently attached to or removed from the motor, and being composed entirely of sheet metal, it may be easily and cheaply produced.

It is obvious that various modifications the construction shown in the drawings and above particularly described. within theprinciple and scope of I my invention.

I claim: r

1. In a dynamo-electriqmachine, a brush holder comprising a guide tube open along one side, a movable pressure member adapted to bear against the rear end of the brush in the guide tube and including a portion extending in front of the longitudinal opening and arranged to prevent the brush'from escaping from the opening, and resilient means engaging the pressure member and holding it resiliently against the rear end of the brush.

2. In a dynamo-electric machine, a brush holder comprising a guide tube open along one side, a supporting arm for the guide tube, a pressure arm pivoted to the supporting arm and having a brush-engaging finger extending into the longitudinal opening in rear of the brush and having a handle portion extending infront of the longitudinal opening and arranged to prevent the brush from escaping from the opening, and resilient means tending to rotate the pressure arm upon its pivot to resiliently press the brush-engagingfinger against the rear the longitudinal opening in rear of end of the brush and hold the brush in yielding engagement with a commutator.

'3. In a dynamo-electric machine, a brush holder comprising a sheet metal .guide tube for the brush having a longitudinal opening along one side afiording access to the brush 7 in the guide tube, guide arm pivoted to the supporting arm and'having a brush-engaging finger extending into the brush and having a handle portion extenda, supporting arm for the and arranged to prevent the brush from escapingfrom the opening, and resilient means tending to rotate the pressure arm upon its pivot to resiliently press the brushengaging finger against the rear end of the brush and hold the brush in yielding engagement with the commutator.

4. In a dynamo-electric machine, holder comprising a sheet metal guide tube for the brush having a longitudinal opening tube integral therewith, a pressure longitudinal opening a brush 7 along one side affording access to the brush in the guide tube, two oppositely extending supporting arms integrally joining the tube at the respective edges of the opening, a pressure arm pivoted to one supporting arm and having a brush-engaging finger extending into thejlongitudinal opening in rear of the brush and having a handle portion extending in front of the longitudinal opening and arranged to prevent the brush from escaping from the opening, resilient means tending to rotate the pressure arm upon its pivot to resiliently press the brush-engaging finger against the rear end of the brush and hold the brush in yielding engagement with the commutator, a terminal securing finger integral with the other supporting arm and cooperative therewith to clamp an electric terminal, and a clamping screw operative to draw the finger and supporting arm together to exert the clamping action.

In witness whereof I subscribe my signature. 

